Umbrella-type folding frame particularly for push-chairs

ABSTRACT

An umbrella-type folding frame ( 1 ) particularly for push-chairs and the like, has a pair of front upper ( 2   a′,    2   b ′) and lower ( 2   a   , 2   b ) struts, a pair of rear struts ( 3   a   , 3   b ), at least one lock/release mechanism ( 44, 45 ) between each upper strut ( 2   a   ′, 2   b ′) and its respective lower strut ( 2   a   , 2   b ), an articulated connection structure ( 5 ) between said rear struts ( 3   a   , 3   b ) and a lifting handle ( 8 ), connected to the said articulated structure ( 5 ), which is designed, upon being actuated, to cause the frame ( 1 ) to set from an open or extended position to a closed or collapsed position and a driving device ( 9 ) located on said frame ( 1 ) at the said lifting handle ( 8 ) for the remote control of said lock/release mechanism ( 44, 45 ).

BACKGROUND OF THE INVENTION

[0001] The present invention relates to an umbrella-type folding frame particularly, but not exclusively, suitable for push-chairs and the like.

[0002] As is known, push-chairs with umbrella type folding frames, i.e. that fold both transversely and longitudinally, are quite common. Besides push-chairs, prams and infant seats for cars can be hooked onto these frames.

[0003] Generally speaking, folding of these umbrella-type frames takes place in two distinct stages, firstly the user has to release a lock/release articulation mechanism between an upper strut (also called the handle tube) and a lower strut (also referred to hereinafter as the front leg tube) and only after this can the active folding process be carried out.

[0004] The releasing of the lock/release mechanism is normally effected by acting on the devices located at the push-chair handle or at the mechanism itself, while the active folding stage is carried out by means of suitable lifting handles or by pressing or pushing the handle tube downwards to go from an open to a closed position. This generally means that the user has to employ both hands to close the frame and, in any case, has to carry out two distinct operation steps which make the closing process laborious and also increases the time taken by such an operation.

SUMMARY OF THE INVENTION

[0005] The main object of the present invention is to avoid the inconvenience referred to above by providing an umbrella-type folding frame particularly, but not exclusively, suitable for push-chairs and the like.

[0006] In this contest, an object of the invention is to provide an umbrella-type folding frame that can be folded or unfolded with a single operation.

[0007] Another object of the present invention is to provide an umbrella folding frame that its easy and practical to use.

[0008] Not last object of the present invention is to provide a structurally simple foldable frame that can be produced at low cost.

[0009] These and other objects that will be better appear below, are achieved by an umbrella-type folding frame particularly for push-chairs and the like, comprising a pair of front upper and lower struts, a pair of rear struts, a pair of support or engagement rigid members each having one end thereof pivoted to a respective rear struts and its other end slidably engaged with a respective upper strut and secured to a respective lower strut, at least one lock-release mechanism between each upper strut and its respective lower strut, a lifting handle, an articulated connection structure between said rear struts, a lifting handle and one driving device located on said articulated structure at the said lifting handle and arranged to control said lock-release mechanism, whereby the sequential effect of said driving device being actuated and said lifting handle being lifted causes the folding frame to set from an open or extended position to a closed or collapsed position.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Further features and advantages of the present invention will become better apparent from the following detailed description of some currently preferred embodiments thereof given by way non-limiting examples only, with reference to the accompanying drawings, in which:

[0011]FIG. 1 shows a perspective view of a folding frame according to the invention in its open condition;

[0012]FIG. 2 shows a perspective view of a folding frame while being closed;

[0013]FIG. 3 shows a perspective view of a folding frame according to the present invention while being closed or collapsed for transportation;

[0014]FIG. 4 is a diagrammatic perspective view of a double four-bar linkage in its extended position arranged to connect rear struts of the folding frame of FIG. 1;

[0015]FIG. 5 is a diagrammatic perspective view on a slightly enlarged scale of the double four-bar linkage of FIG. 4 in its partly folded or collapsed position;

[0016]FIG. 6 shows a side elevation view of a push-chair attached to a folding frame according to the invention when opened;

[0017]FIG. 6A shows a detail on an enlarged scale of FIG. 6;

[0018]FIG. 7 shows a view similar to that of FIG. 6 while the lock/release mechanism is being actuated;

[0019]FIG. 8 shows a similar view of that of FIG. 7 while the lock-release mechanism is also being lifted upwards after having been actuated;

[0020]FIG. 9 shows a view similar to that of FIG. 8 with the frame fully closed or folded;

[0021]FIG. 10 shows a detail on an enlarged scale of FIGS. 6 to 9;

[0022]FIG. 11 is a side elevation view of a push-chair provided with a folding frame mechanism according to a further embodiment of the invention shown in its opened position;

[0023]FIG. 12 illustrated a detail on an enlarged scale of FIG. 11;

[0024]FIG. 13 shows a perspective view of a pistol grip handle;

[0025]FIG. 14 is a side elevation view of the pistol grip handle illustrated in FIG. 13;

[0026]FIG. 15 shows a perspective view of another embodiment of handle grip;

[0027]FIG. 16 shows a side elevation view partly in cross-section of the handle grip of FIG. 15;

[0028]FIG. 17 shows a perspective view of a handle mounted for rotation on the frame according to a further embodiment of the present invention;

[0029]FIG. 18 shows a perspective view of a further embodiment of control handle;

[0030]FIG. 19 shows a side elevation view partly in cross-section of the handle of FIG. 18;

[0031]FIG. 20 is e diagrammatic perspective view of a modification of the handle of FIGS. 18 and 19;

[0032]FIG. 21 shows a perspective view of a lever handle and locking mechanism assembly;

[0033]FIG. 22 shows a side elevation view partly in cross-section of the assembly illustrated in FIG. 21 while being in its locked position;

[0034]FIG. 23 shows a side elevation view of the assembly illustrated in FIG. 21 while being activated and released;

[0035]FIG. 24 shows a side elevation view of the assembly illustrated in FIG. 21 in its released condition and while the folding frame is being lifted;

[0036]FIG. 25 is a side elevation view partly in cross-section of a modification of the lever handle and locking mechanism assembly of FIG. 21 in its locked position; and

[0037]FIGS. 26 and 27 show the assembly of FIG. 25 while the locking mechanism is being released and the lever handle is being lifted, respectively.

[0038] In the Figures of the accompanying drawings the same reference numerals have been used to indicate the same or similar components or parts.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0039] With reference first to the embodiment shown in FIGS. 1 to 14, an umbrella-type folding frame particularly, but not exclusively, suitable for push-chairs and the like according to the present invention, is generally indicated by the reference numeral 1 and comprises a pair of upper and lower front struts, in particular a pair of upper struts (handle tubes) 2 a′ and 2 b′ linked to a pair of lower struts (front legs tubes) 2 a and 2 b, a pair of rear struts 3 a and 3 b and support rigid members or cases 4 a and 4 b for the articulation of each front strut with its respective rear strut, as further explained hereinbelow. As better visible in FIGS. 4 and 5, the rear struts 3 a and 3 b are connected to each other by an articulated structure comprising a double four-bar linkage 5 (known per se in the art) comprising upper bars 6 a′, 6 b′ and lower bars 6 a 6 b, diagonal braces 7 a and 7 b and a rod 60 which is arranged vertical in use.

[0040] The articulated structure also has a lifting handle 8 for manoeuvring the four-bar linkage 5 and lifting the entire folding frame so as to cause the folding frame, while in its open or extended position (FIG. 1), to take, if desired, a closed or collapsed position (FIGS. 3 and 9). The lifting handle 8 is secured to an articulation upper pin or node 5 a (FIG. 13) to which one end of the upper bars 6 a, 6 b and the (upper) end of the rod 60 are linked.

[0041] The four-bar linkage 5 also has a lower pin or node 5 b to which one end of the lower bars 6 a, 6 b and the (lower) end of the rod 60 are linked. Usually, pin 5 b also supports a pedal block 5 c on which a user's foot can rest while user's hand exerts a lifting force on the handles 2 c, in order to make the opening operation easier and quicker and to make sure that double four-bar linkage 5 is fully extended.

[0042] Along the rod 60, which is linked to upper pin 5 a and lower pin 5 b, a cursor 5 k is slidably mounted to which one end of each of the diagonal braces 7 a, 7 b is linked, the other end of the diagonal braces 7 a, 7 b being pivoted at 67 a, 67 b to a respective rear strut 3 a, 3 b together with the other end of the lower bars 6 a, 6 b.

[0043] The double four-bar linkage 5 described above, when in its extended position, keeps the rear struts 3 a and 3 b spaced apart from each other and the cursor 5 k is located in its uppermost position on the rod 60 (FIG. 4), thereby allowing use, e.g. of a push-chair, whereas when in its collapsed position the cursor 5 k is caused to slide downwards along the rod 60 and the same struts are moved together so that the frame is folded up for easy transportation (FIG. 5).

[0044] The rear lifting handle 8 is arranged to co-operate with one centralized control device 9 for the remote-control of the motion transmission means 4 a and 4 b and/or the lock-release mechanisms as described hereinbelow.

[0045] As is better shown in FIGS. 4, 5, 13 and 14, the driving device 9 is a manual device, i.e. it comprises a lever 9 a pivoted through a pivoting fulcrum 10 to the handle 8 that has an end linking portion 8 a linked to the articulated the upper bars 6 a′, 6 b′ at pin 5 a and an oblong portion 8 b which acts as a resting member for the user's hand while actuating the lever 9 a, so as to make the manoeuvre easier. The driving device 9 is designed to control through two steel cables 11, which advantageously are of the sheathed type, a control lever 41 (FIGS. 6 to 9) linked at a respective fulcrum 42 secured to the folding frame and spring loaded by a return spring 41 a, preferably supported by the support cases 4 a, 4 b (FIG. 6A).

[0046] More particularly, by acting on the centralized driving device 9 the two steel cables 11 are actuated which operate a respective lever 41 of the transmission means 4 a, 4 b, whereby each lever 41 is caused to be angularly displaced in order to displace a respective upper pin 43 e.g. projecting from an upper strut 2 a′, 2 b′ and secured to a respective control rod 44. Each control rod 44 is slidably mounted inside a respective upper tubular strut 2 a′, 2 b′ and has a lower transverse pin 45, which can also project from its locating upper strut. The control rod 44 is preferably resiliently loaded, e.g. by a return spring 44 a. The lower pins 45 are each designed to engage with a respective hook 46 secured to its adjacent lower strut 2 a, 2 b when the folding frame 1 is in its opened or extended position.

[0047] At its lower end each upper strut 2 a′, 2 b′ is linked to its respective lower strut 2 a, 2 b by means of a respective connecting rod 47.

[0048] More particularly, the transmission means 4 a, 4 b comprises a rigid support body or case that locate a respective lever 41, a return spring 41 a and has one end thereof pivoted at 34 (FIG. 6A) to the upper end of a respective rear strut 3 a, 3 b and its other end slidably engaged with a respective upper strut 2 a′, 2 b′ and secured to a respective lower strut 2 a, 2 b. Thus, the resultant movement of the upper struts 2 a′, 2 b′ with respect to the lower struts 2 a, 2 b is a combination movement of a sliding displacement through its respective case or body 4 a, 4 b and a pivotal movement caused by the connecting rod 47.

[0049] Moreover, in the above described embodiment of the invention the driving device 9 also acts as a locking means arranged to removably secure the cursor 5 k in its uppermost position on the rod 60 in order to block the four-bar linkage 5 in its opened or extended position, so that any unwanted movement of the four-bar linkage 5 is prevented. To this end, the lever 9 a is formed with an end tooth 9 b designed to engage with a recess 85 provided in the cursor 5 k when the four-bar linkage 5 is in its extended position and the lever 9 a is in its released position, as better apparent from FIGS. 4, 13 and 14, and to be disengaged therefrom when the lever 9 a is actuated by the user or the four-bar linkage 5 is in a collapsed or closed condition (FIG. 5).

[0050] Advantageously, lever 9 a has a lower inclined-plane surface 90 arranged to automatic engage tooth 9 b with opening 85. The lever 9 a can also be provided with a limit button 9 c (FIGS. 13 and 14) arranged to abut against a respective notch 8 c in the lifting handle 8 to prevent the engagement tooth 9 b from accidentally becoming disengaged from recess 85.

[0051] In the embodiment shown in FIGS. 11 and 12, components 41, 41 a, 43 and 44 of the transmission means are omitted and thus cables 11 are directly secured to a respective pin 45 and/or extend through the lower tubes 2 a, 2 b to reach a pin bearing member 45 a which is resiliently loaded by spring 44 a. In this case, the hook 46 is secured to the upper struts 2 a′, 2 b′ and arranged upturned, whereby pin 45 is pulled by its respective cable 11.

[0052]FIGS. 15 and 16 illustrate another embodiment of lifting handle 8 and driving device 9, in which the lifting handle 8 comprises a grip portion 8 d shaped as a frame pivoted at 8 e to a support block 8 a secured to the upper node or pin member 5 a supported by the articulated structure 5, whereas the driving device 9 includes a manual rocking member 9 d that is pivoted to one end 9 e of the grip portion 8 d of the lifting handle. The rocking member 9 d is arranged to actuate the sheathed cables 11 that are directly connected to it in order to actuate the transmission means 4 a and 4 b and/or the pin bearing member 45 a.

[0053]FIG. 17 shows a further embodiment of lifting handle 8 and driving device 9, in which the handle 8 is rotatably mounted on a support block 8 a secured to the upper pin 5 a. The pin 5 a also supports a pulley 80 and a support member 8 a which is thus arranged between handle 8 and pulley 80. The pulley 80 is rigid in rotation with the pin 5 a and the handle 8. At two diametrically opposite positions of the pulley 80 one end of a cable 11 is secured whose other end is connected either to the motion transmission means or directly to the pin bearing member 45 a.

[0054] The support member 8 a has one or a pair of downwardly extending lugs 82, to which a trigger-like lever 9 is hingedly hung at 84 which is formed with an engaging tooth 9 b designed to engage with an opening 85 provided in the cursor 5 k. If desired, the trigger-like lever 9 can be spring-loaded so as to be urged forward, i.e. into engagement with the opening 85, and is formed with a lower inclined-plane surface 90 for automatic engagement of lever 9 with the opening 85.

[0055] With this arrangement, an angular displacement or partial rotation (e.g. such as indicated by arrow 21) of the handle 8 results in the cables 11 being actuated, thereby controlling either the motion transmission means 4 a, 4 b or directly the pin-bearing member 45 a so as to unlock pin 45 from hook 46 before lifting the folding frame 1 (push-chair) for causing it to collapse before lowering it against a support, e.g. the ground, for causing the same to be erected.

[0056] A further embodiment of lifting handle 8 and driving device 9 is shown in FIGS. 18 and 19, wherein the handle 8 has an end T-shaped handling portion 83 and a shank portion 86 on which a manual annular flanged member 9 f secured to one end of cables 11 is slidably mounted, so that it can be moved to and fro on the shank portion 86 in contrast with a resilient means, e.g. a return spring 12. The annular component 9 f also has an engaging tooth 87 projecting downwards that, when the frame 1 is in its open position, is arranged so as to engage with, and to be retained in, a recess 13 a formed in a lever member 13. Lever member 13, in turn, has its lower end pivoted at 13 b to the cursor 5 k and its upper end 13 c shaped as a hook designed to engage a respective notch in a fixed portion 8 a of the lifting handle 8.

[0057] If desired, the lever member 13 can be spring loaded so as to keep it urged towards the cursor 5 k and the upper end 13 c has its upper front shaped as an inclined plane surface so that the hook automatically engages with the notch while the folding frame 1 is being erected to its opened position.

[0058] Moreover, the shank portion 86 is tubular in structure and has a pair of side slots 86 a, in which a transverse pin 86 b is slidably mounted and has projecting ends secured to the flanged member 9 f.

[0059] More particularly, the fixed portion 8 a is shaped as an upwardly directed fork, to which the remote end of the shank 86 is pivoted at 88, and is secured at the bottom thereof to upper pin 5 a of the four-bar linkage 5.

[0060] A modification is shown in FIG. 20, wherein the annular sliding component 9 f is replaced by a pair of crank-like levers 9 h to which an end of a respective cable 11 is secured. Each lever 9 h has one end pivoted at 9 i to the shank 86 of handle 8 and its other end extending at right angles thereto and shaped a small handle.

[0061] To cause folding frame 1 to collapse, the user first pulls (against the action of springs 12 and 44 a) the annular member 9 f or the crank levers 9 h towards the T-shaped portion 83 (arrow 89 a) so as to disengage pins 45 from their respective hooks 46 and the hook 13 c from its respective engaging notch. He then lifts the T-shaped portion 83 upwards (arrow 89 b), thereby causing the stem 86 to pivot about the transverse pin 88, thus unlocking the lever member 13. By further lifting the folding frame 1, the user caused it to collapse owing to the weight of the lifting frame.

[0062] Another embodiment of lifting handle and driving device 9 is shown in FIGS. 21 to 24, where the lifting handle 8 comprises a handle frame portion 8 d, which is articulated at 88 to a support block 8 a that is connected to the upper node or pin 5 a. Handle frame portion 8 d is connected to one end of the cables 11. There is also provided a lever member 13 having its lower end pivoted to the cursor 5 k at 13 b and having an upper engaging tooth 13 c arranged to engage with an extension of upper pin 5 a. If desired, the lever member 13 can be spring loaded so as to keep it urged towards the cursor 5 k.

[0063] When the folding frame 1 is in its opened condition the handle frame portion 8 d is in a substantially horizontal position (FIG. 22). For causing the folding frame 1 to collapse, the user pulls backwards the lever member 13 with a finger so as to disengage its tooth 13 c from the lug of pin 5 a, then lifts the handle 8 d thereby disengaging pins 45 from their hooks 46. By further lifting the folding frame 1, the folding frame 1 is easily caused to collapse.

[0064] It will be realize that also in this case by simply lifting the handle 8 unlocking of pins 45 is caused, which results in substantial simplification of the manoeuvre. In order to ensure proper operation of this embodiment in any circumstance, care should be taken, when the folding frame is to be folded from its extended or opened condition, that the effort for partial rotation of the handle 8 for causing pins 45 to disengage from their respective hooks 46, is much lower than the total weight of the folding frame 1, otherwise it might happen that owing to friction or another resisting cause the initial rotation of the handle 8 could result in the folding structure 1 being lifted from ground while the pins 45 are still in engagement with their respective hooks 46, which would prevent folding of the folding frame 1.

[0065] On the other hand, once the pins 45 have been disengaged from their hooks 46 collapse of the folding frame 1 occurs as a consequence of the entire structure being lifted upwards still by acting on handle 8.

[0066] FIGS. 25 to 27 show a modification of the lever member 13 of FIGS. 21 to 24, in which unfolding of the folding frame 1 occurs in two stages. The lever member 13 is shaped as a bell crank and pivoted to the handle 8 d at 100 so that one arm of the lever member extends, in use, substantially parallel to the rod 60 and terminates with an engaging tooth 13 c designed to engage with a respective recess 85 provided in the cursor 5 k, whereas the other arm 13 e is inclined with respect to arm 13 d and extending towards the support block 8 a. The bell crank 13 is spring biased, e.g. by a spiral pressure spring 101 having one end resting against the handle 8 d and its other end abutting against the arm 13 e thereby pushing it away from the handle, thus keeping tooth 13 c in its engaged position with recess 85.

[0067] In order to fold the folding frame 1 starting from its fully extended position, the operator first acts on arm 13 e by a finger of his hand handling handle 8 d so as to cause tooth 13 c to disengage from recess 85 against the action of the spring 101. The user then lifts the handle 8 d, while keeping his finger on the arm 13 e, whereby causing it to pivot about its pivot pin 88 while releasing the locking mechanism owing to the action of cables 11.

[0068] It will be noted that the umbrella-type folding frame according to the present invention operates in a very simple manner.

[0069] In order to cause collapse of the folding frame from its open (or extended) position to a closed (or collapsed) position, the user has simply to actuate the driving device 9 and lift handle 8 by hand. By so doing the pins 45 are caused to unlock against the thrust of the spring 44 a, thus releasing the lower struts 2 a, 2 b from their respective upper struts 2 a′, 2 b′.

[0070] By further lifting the handle 8 the very weight of the entire structure is normally well suited to lead to collapse (or closure) of the folding frame owing to the of operative connection between the components parts, as is well known in the art, e.g. as disclosed in Italian Utility Models no. A-208 263 and no. A-213 692 (both in the name PEG PEREGO). At the end of the lifting operation, the folding frame is fully closed as shown in FIG. 10 and can be easily carried or stored by the user.

[0071] Disengaging of the lower pins 45 not only releases the upper struts 2 a′, 2 b′ but also causes pushing of the upper struts 2 a′, 2 b′ downwards owing to the action of springs 44 a. This pushing force overcomes any resistance by the connecting rods 47 and causes a partial rotation upwards of the connecting rods 47 with no jibbing which is of great benefit for the efficiency of the collapsing movement of the folding frame 1.

[0072] When moving from closed to open position, closed folding frame 1 is “pulled upwards” at terminal handles 2 c. The upper struts 2 a′, 2 b′ effect the same movements as in the closing stage but in the reverse direction, thereby moving apart the rear struts 3 a and 3 b with the result that the double four-bar linkage 5 is extended while the lower pins 45 fit into their locking hooks 46, thus blocking any relative movement between the struts.

[0073] Preferably, a pushing action exerted by user's foot on block 5 c is added to ensure full extension of double four-bar linkage 5.

[0074] If desired, the driving device 9 can comprise a radio transmitting system, e.g. controlled by an automatic button, to transmit a control signal to the motion transmission means 4 a, 4 b or directly to pins 45.

[0075] The invention as described above is susceptible of numerous modifications and variations within the scope of the claims.

[0076] Thus, for example the connection means between the handle grip 9 and the motion transmission means 4 a, 4 b could be one of a number of mechanical means (e.g. struts, stay rods and various mechanical, electromagnetic or pneumatic or hydraulic systems).

[0077] The disclosure in Italian patent application no. VR2001A000022 filed on Feb. 20, 2001 from which priority is claimed is incorporated herein by reference.

[0078] Any reference sign following technical features in any claim has been provided to increase intelligibility of the claim and shall not be construed as limiting the scope of the claim. 

1. An umbrella-type folding frame (1) particularly for push-chairs and the like, comprising a pair of front upper (2 a′, 2 b′) and lower (2 a, 2 b) struts, a pair of rear struts (3 a, 3 b), a pair of support or engagement rigid members (4 a, 4 b) having one end thereof pivoted to a respective rear struts (3 a, 3 b) and its other end slidably engaged with a respective upper strut (2 a′, 2 b′) and secured to a respective lower strut (2 a, 2 b), at least one lock-release mechanism (45, 46) between each upper strut (2 a′, 2 b′) and its respective lower strut (2 a, 2 b), a lifting handle (8), an articulated connection structure (5) between said rear struts (3 a, 3 b), a lifting handle (8), and one driving device (9) located on said articulated structure (5) at the said lifting handle (8) and arranged to control said lock-release mechanism (45, 46), whereby the sequential effect of said driving device (9) being actuated and said lifting handle (8) being lifted causes the folding frame (1) to set from an open or extended position to a closed or collapsed position.
 2. A folding frame according to claim 1, wherein said driving device (9) includes a manual actuation member (9 a) arranged to move from a working to a rest position thereof.
 3. A folding frame according to claim 1, wherein said driving device (9) comprises a manual actuation member (9 a, 9 d, 9 f, 9 h 80, 8 d) and a motion transmission means (11; 41, 41 a, 43, 44, 44 a) arranged between the said manual actuation member (9 a, 9 d, 9 f, 9 h 80, 8 d) and said lock/release mechanism (45, 46).
 4. A folding structure as claimed in claim 1, wherein said handle (8) comprises a supporting member or portion (8 a) secured to said articulated structure (5).
 5. A folding frame as claimed in claim 1, wherein the said articulated structure (5) comprises a cursor member (5 k) designed to slide on a rod member (60) while the folding frame is being folded or unfolded.
 6. A folding frame according to claim 5, wherein the said driving device (9) comprises safety locking means (9 b, 85; 13 a, 87; 13 c, 5 a; 13 c) arranged removably to secure the said lifting handle (8) to said cursor member (5 k) or to said articulated structure (5).
 7. A folding frame as claimed in claim 6, wherein the said locking means comprises an engaging tooth (9 b) designed to engage with an opening (85) provided in said cursor member (5 k) when the said articulated structure (5) is in its extended position.
 8. A folding frame as claimed in claim 6, wherein the said locking means comprises an actuation lever member (9 a) having an inclined-plane surface (90) arranged to automatic engage tooth (9 b) with opening (85) formed in said cursor member (5 k).
 9. A folding frame as claimed in claim 6, wherein the said actuation lever member (9 a) comprises a notch (8 c) in said lifting handle (8) and a limit member (9 c) arranged to abut against said notch (8 c) thereby preventing the said engagement tooth (9 b) from accidentally disengaging from recess (85).
 10. A folding frame as in any claims 6 to 9, characterized in that the said actuation lever member (9, 9 a) comprises a loading spring.
 11. A folding frame according to claim 1, wherein said lifting handle (8) comprises an oblong element (8 b) carried by said articulated structure (5) and the said manual actuation member (9 a) comprises a lever member articulated to said oblong element (8 b) and arranged to actuate the said motion transmission means (11, 41, 41 a, 43, 44, 44 a).
 12. A folding frame according to any previous claim 1, wherein said lifting handle (8) comprises a grip (8 d) secured to said articulated structure (5) and a manual actuation member (9 d) mounted for angular displacement or rotation relative to said grip (8 d) and a motion transmission means (11) between said angularly displaceable grip (9 d) and said at least one lock/release mechanism (45, 46).
 13. A folding frame according to claim 4, wherein said handle grip (8) comprises a rotating portion pivoted to said supporting member or portion (8 a) and a pulley member (80) rigid in rotation with said handle (8) and operatively connected to said motion transmission means (11, 41, 41 a, 43, 44, 44 a).
 14. A folding frame according to any claims 1, wherein said handle (8) comprises an end T-shaped handling portion (83) and a shank portion (86) and in that it includes an annular flanged member (9 f) operatively connected to one end of said motion transmission means (11) and slidably mounted on the said shank portion.
 15. A folding frame as claimed in claim 14, wherein the said locking means comprises a lever member (13) having one end thereof pivoted to the said cursor member (5 k) and its other end (13 c) shaped as a hook, and an engaging projecting tooth (87) that, when folding frame (1) is in its open position, is in engagement with, and retained in a recess (13 a) formed in said lever member (13).
 16. A folding frame according to claim 14, comprising resilient means (12) for resiliently loading said flanged member (9 f).
 17. A folding frame according to claim 1, wherein said handle (8) comprises a frame lever element (8 d) secured to said articulated structure (5) and operatively connected to said motion transmission means (11).
 18. A folding frame as claimed in claim 17, wherein the said locking means comprises a lever member (13) having one end thereof pivoted to the said cursor member (5 k) and its upper end formed with an engaging tooth (13 c) arranged to engage with an extension of said articulated structure (5). 19 A folding frame as claimed in claim 18, wherein the said lever member (13) has the said other end at least partly shaped as an inclined plane surface thereby causing the said engaging tooth (13 c) automatically to engage with said extension.
 20. A folding frame as claimed in claim 17, wherein the said lever member (13) is shaped as a bell crank and is pivoted to the said frame handle (8 d), one arm (13 d) of said lever member (13) being formed with said tooth (13 c) designed to engage with a respective recess (85) provided in said cursor member (5 k), whereas the other arm (13 e) extends at an angle with respect to said arm (13 d) towards the said support block (8 a).
 21. A folding frame as claimed in claim 20, wherein the said bell crank (13) is spring biased by a spring (101).
 22. A folding frame according to claim 1, wherein said motion transmission means comprises at least one cable (11), at least one lever member (41) designed to be actuated by said driving device (9) through the at least one cable (11), at least one engagement member (43) arranged to be actuated by the said or by a respective lever member (41), at least one rod member (44) slidingly carried by a respective upper strut (2 a′, 2 b′) and supporting the said or a respective engagement member (43), whereby actuating the said lock-release mechanism (45, 46).
 23. A folding frame according to claim 22, wherein said at least one cable (11) is a sheathed cable.
 24. A folding frame according to any previous claim 22 or 23, characterised in hat said motion transmission means (11) comprises at least one strut component (44).
 25. A folding frame according to claim 24, characterised in that said strut component (44) comprises at least one stay bar.
 26. A folding frame according to any previous claims 23 to 25, characterised in that said motion transmission means (11) comprises an electrically driven motion transmission means.
 27. A folding frame according to any previous claims 23 to 25, characterised in that said motion transmission means (11) comprises fluid-operated motion transmission means.
 28. A folding frame according to any previous claim, characterised in that the said at least one lock/release mechanism comprises at least one resiliently loaded control member (44) operatively connected to and controlled by said motion transmission means (11).
 29. A folding frame according to any previous claim, characterised in that the said at least one lock/release mechanism (44, 45) comprises an electromechanical control system. 